Hold over



Aug 2,

s i: s.

T. C. WHITEHEAD HOLD-OVER Filed June 14. 1926 gigi A TTOR-NE YAS' "Patented Aug. 2, 1927.

UNITED STATES moms c. wm'rnnnan,

OF DETROIT, MICHIGAN.

HOLD VEB.

Application led June 14,

This invention relates to mechanical refrigerating apparatus and. more particularly to a boiler or expansion coil unit for use in such an apparatus. l i

In the boiler or expansion coil units now in use the body or core for supporting the refrigerant receiving tube` has usually been formed of metal having a high cceicient of heat transmission and being so proportioned l0 as to adapt the bodyl to actas a holdover, or, in other words, to respond slowlyl to changes in temperature. Such a construction is very expensive tp manufacture and it is therefore the objectief the present 1n- 35 vention to provide a construction which is just as eicient a holdover as the devices heretofore used and which is very much cheaper to manufacture.

-With theseand other objects in view, the invention resides in certain novel features of construction, combinationsv and arrangements of parts as will be more fully described and particularly pointed out in the appended claims.

In the accompanying drawings: u Figure 1 is a perspective view o f a boiler or expansion coil unit constructed in accordance with my invention; n

Figure 2 is a vertical longitudinal sectional view through tlie device;

` Figure 3 is al modification showing a slightly dierent arrangement of the tubes.

Referring now particularly to the d rawings wherein like reference characters indicate like parts, it will be noted that there is illustrated a body formed preferably of sheet metal or any similar inexpensive material. This body in the form herein shown is shaped preferabl rectangularly in cross section to provide t e top 11, bottom 12 and sides 13. The body is formed preferably with openingsor passages lll-therethrou h which may be formed by means of partition walls 15. The openings or passages 14 not only provide for a free and ecient circulation of the air through the' unit, but ,also provide compartments for freezing water cubes, fruits and the like.

The refrigerantgreceiving tube constituting the expansion coil is indicated by the reference characterv 16 and is shown as wound around the body or core 10 with the coils or convolutions thereof arranged side by side longitudinally 'of the body. In the present invention this tube is formed with 1926. Serial No. 116,029. i

a larger diameter than the tubes usuall employed in this connection and as a resu t thereof a larger volume of refrigerant will circulate around the bod 10 without the necessity of providing ad itional tubing.

In view of the fact that the body 10 is formed preferably of an inexpensive sheet metal construction, which of course does not have a high coellicient of heat transmission, some other means must necessarily be provided to act as la holdover.l In the resent instance I provide what will herea ter be termed a water tube, which -is designated at 17, and is also wound around the body core' 10 upon the refrigerant receiving tube 16 in such a manner that the convolutions of the water tube 17 nest between the convolutions of the tube 16, as clearly shown in Figure 2. Such an arrangementrovides suiicent thermal contact between t e tubes to form an efficient holdover of the water tube 17. Preferably a non-freezing solution of calcium chloride and water is circulated through the tube 17. It has been found that such a solution has a high thermal capacity and that a very eiicient holdover is provided which is in every way equal if not superior, to the type .heretofore used.

A slightly dih'erent arrangement of tubes is shown in Figure 3 in which two separate water tubes 18 and 19 are provided, one interposed between the body 10 and the coils of the refrigerant receiving tube, and the other resting on top of the aforesaid coils so that the convolutions of the water tubes are nested between the convolutions of the refrigerant receiving tube at diametrically opposite sides thereof The body is preferably formed with outwardly laterally extending flanges 20 at the ends thereof forming shoulders or-stops 21 Ato prevent any relative longitudinal movement between the different coils and the body, these flanges being also preferably of suiicient dimensions as to proect beyond and conceal the convolutions of the tubes 16 and 17 when the unit is viewed from the eng` theretlilf. f 1H be rom t e ore 0in it w' a arent that an expansio coil unit has heldin., prolos `vided which is simple in construction, ellicient in operation and cheaply manufactured. l

While itis believed that from the foreno going description, the nature and advantage Vic l freezln of my invention will be readill apparent, I i desire to have it understood t at do not limit myself to what is herein shown and described and that such chan may be refsorted to when'cdesired as all within the sco e of what is claimed. 4 l y vghat I claim as m invention is: p

1. In a mechanica `refrigerating apparatus, an expansion coil unit comprising', refrigerant receiving tube, tubing Afor a non solution in lthermal contact with said re igerant receiving tube and serving as a: holdover, and a body constituting a core around which said tubes are wound.

2. In a mechanical refrigerating appar tus, an expansion coil unit comprising a refrigerant receiving tube, tubing for a nonf .freezing solution and a-bodylconstituting a f core around which said tubes are wound, the

convolutions of the tubing containing the v non-freezing solution being nested between holdover, and a. .body constitutin varound which said .tubes are wenn the convolutions of the refrigerant receiving tube and servingas a holdover. e

,3. In amechanical refrigerating apparatus, an expansion coil -unit comprising a refrigerant receiving tube, tubing for a nonfreezin solution in thermal contact with said re rigerant receiving tube lat diametrically opposite jsidee'thereof and serving as a a core 1 '4. In .a mechanical refrigerating apparatus, an expansion coil .unit comprising a refrigerant receiving tube, tubing for a nonfreezing 'solutionfa body constituting a core around which' said tubes are wound, the conneazecs volutions of the tubing containing the non-v "tus," an expansion coil unit comprising a refrxgerant receiving tube, tubing for a nonfreez-mg solutlon, and a-body constituting a support upon which said tubes are mounted, the convolutions ofthe tubing containing the non-freezing solution bein nested between the convolutions of the refrigerant receiving tube and serving as a holdover.

6. In a refngerating apparatus, an expension coil unit com rising a refrigerant receiving tube, tubing or a non-freezin solution in thermal contact with said refri erant receivin tube and a hollow body of ow thermal con uctivity forming a material receiving compartment, upon which said tubls Vare mounted in thermal contact therewit 7 .In 'a refrigerating apparatusz an expansion coil unit comprising a refrigerant receiving tube, tubing for a non-freezing solution in thermal contact with said refrigerant receiving tube andV ving as a ,hold-over and a hollow bodl constituting a support upon which said ubes are mounted, said body being of low thermal-conductivity for allowing the ready transmission of heat therethrough to the. interior thereof.4

In testimony whereof I'ailix my signature.

1 THOMAS c; WHITEHEAD. 

